Has anyone's AF ever been 11 days early ?

I had some spotting yesterday but I thought it may be ovulation. Then when I got up this morning it looks as if AF has come today. WTH, it's 11 days early. This has never happened before or after I got my IUD. I'll have had my IUD 2 years in June.

I'm wondering what's going on. I got mu flu shot yesterday morning. I wounder if it possible for it to through your body of at all